package com.laoxu.java.thread;

/**
 * @Author laoxu
 * @Date 2022/11/23 15:13
 * @Desc 线程协作之信号灯法
 */
public class ThreadSignalLamp {
    public static void main(String[] args) {
        TV tv = new TV();
        new Player(tv).start();
        new Watcher(tv).start();
    }
}

class Player extends Thread{
    TV tv;
    public Player(TV tv){
        this.tv = tv;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            if(i%2==0){
                this.tv.play("天天向上");
            }else{
                this.tv.play("随机广告");
            }
        }
    }
}

class Watcher extends Thread{
    TV tv;
    public Watcher(TV tv){
        this.tv = tv;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            tv.watch();
        }
    }
}

class TV{
    String voice;
    boolean flag = true;

    // 表演
    public synchronized void play(String voice){
        if(!flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("演员表演了："+voice);
        this.notify();
        this.voice = voice;
        this.flag = !this.flag;
    }
    // 观看
    public synchronized void watch(){
        if(flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("观看了："+this.voice);
        // 通知演员表演
        this.notifyAll();
        this.flag = !this.flag;
    }
}
